Electric circuit.



c. C. GOULD. ELECTRIC CIRCUIT.

Patanted lune 26, I900.v

(Application med Jun. 21, 1899. Renewed Feb. 23, 1900.)

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sPnoIFreATroN forming part of Letters Patent No. 652,459, dated June 26, race.

Application filed January 21 1899.. Renewed lebrnary 2 3, 1900. Serial No. 6,305. (No model-l To all whom it may concern:

. Be it known thatI, CORNELIUS C. GOULD,

a citizenof theUnited Sta-tes, residing at the city ofPhiladelphia,-in the county of Philadelphia and State of Pennsylvania, have invented'certain new and useful Improvements in Electric Circuits, of which the following is '*a specification;

, My invention 'has relation to ineans for increasing the clearness', as well as volume, of sound-wave reproductions in telephone syst {The principal object of my present invention is to provide simple and eliectivemeansr 75 a tion."

, The current in the for eliminatingfthe efiects of outside induccireuit carries-the im-.

pulses generated at the transmitting-station to the receiving station irrespective of induced foreign'currents orstatic induction of its own circuit r k a I Practicalexperiments over a long circuit have demonstrated in asatisfactory manner the efiiciency of myinvention and the correctvention use is made of inductive-resistance ness of the underlying principles thereof.

To accomplish the object of my present incoils of com'parativel y low resistance arranged upon acommon laminated core, the outer ends of the windings of which coils are included in the main circuit, while the inner ends'of the windings are connected with the transmitting and'receiving instruments in a loop of said circuit. The incoming current passesfrom the main line into one of the coils, then to and through the small coil of the receivinginstrument, and out through the second of the pair of coils to ground.

My invention, stated in general terms, consists of the improvements in electric circuits substantially as hereinafter described and claimed.

The nature and scope of my present invention will be more fully understood from the part hereof, in which- Figure 1 is a diagrammatic view of an arrangement'showing a ground electric circuit.

Fig. is a similar view of an arrangement showing a metallic circuit. Fig. 3 is a similaryiew of a modification as to the station arrangement in the circuit; and Figs. 1t and 5 are views, partially diagram matic,of ordinary about three layers ofNo. 18 (B. & S.) insulated wire, with a resistance of' one-half of an ohm each, wound upon a common laminated iron core The inner adjoining ends 12 12' of the coils are connected to aloop 13 of said circuit, and the current passes therethrough and the '6 coil of the receiver 4 to the terminal 12 and to the ground 14, or in the case of the metallic circuit, Fig. 2, to the return-wire of the same. 'lhetransmittin g instru ment? is of any wellkuown type and isplaced in multiple to the loop 13 of the said circuit 1. A battery 5 may be located at a central station, so'that none of the subscribers stations are in need of one, and therefore do not suffer annoyances incident to the care thereof. The battery may be placed in series with the main circuit, as indicated at 5, or it may be placed in multiple, as indicated at 5'. It is a peculiar fact, as practice has demonstrated, that the receiving instrument exercises apeculiarinfluence over so and upon the efiicicncy of the system. One of the important features in this connection is the size and character of the permanent magnet in the receiver. If the windings of the re-' ceiver-coil are decreased, .there is obtained the same result as if the size of the permanent magnet in the receiver be decreasedthat is, the apparatus becomes more efiicient. By increasing the windings in the receiver-coil again objectionable induction or humming noises due to outside inductional effects will be heard, but by adjusting the inductive resistance it is entirely practical to control these eifects. It has been determined by practical experiment that the magnetic field induced by the laminated core influences the incoming current in such manner as that no noises are conveyed to and through the receiving instrument, but only the impulses or soundwaveproductions of the transmitting instrument, thereby establishing the fact that inductive interference is set up between the home and foreign current.

The description of my invention refers mainly to its employment in connection with telephonic systems for transmitting intelligence; but I do not, however, wish to be understood as restricting myinvention to's'uch, as by the peculiar control which I have over the outside induction it is manifestly obvione that it is susceptible of use in other systerns of electric transmission.

' 15 control over the outside induction by proper The peculiar adjustment of the inductive resistance may be made manifest, forinstance, in the production of Morse signals, in apparatus in which total exclusion is bad of all other inductional eflfects and in which the signalsare sent over a wire adjoining a main line having neither a metallic nor a ground connection with the same. It is also obvious that if any of the light and -p eyed, whichlatter dcsireto secure by Letters Patent, is- V and adjoining wire vtwo subscribing witnesses,

described the militiamen- 1. Inhnelectric-circuit system, the combination with afmaincirenit and inductive-resistancecoils located in series with said circult, of a transmi-tterand a receiver in series 4.

with said circuit nd in multiple with eacl.

other, substantiallykas' and for the purposes.

described.

2. In an electric-circuit system, the combination with a main battery-circuit and a pair of inductive resistances in series with said circuit, of a-transmitter and a receiver in series with said circuit and in multiple with each other,s'ubstantially as and for the purposes described.

, 3. In an electric-circuit system, the combination with a battery-circuinof a pair of in-v ductive resistances, oppos te wire ends of which are connected to said battery-circuit ends of which are connected by a loop of said circuit and a translating device in series in said circuit substantially as and for the purposes described. 4. In an electrictelephone system, the combinaiion with inductive resistances on acom- [ilOll core, in series to a main battery-circuit, of a transmitter, in multiple, and areceiver,

in series thereto, substantially as and for the purposes described.

In testimony whereof I have signed my name to this specification','in the presence of this 19th day of January, 1899,. i I

CORNELIUSC. GOULD.

Witnesses: -FRANCIS Wis'rnn,

I E. M. VALENTINE. H 

